I would imagine that they're not put in a classroom environment first and then dropped into a field training environment where they're suddenly faced with a very steep learning curve and a short time-span to learn the basics of being a provider at that level... I would suspect that they're given a certain amount of education and trained gradually with increasing expectation and responsibility throughout the entire program.
I'd imagine that Physicians are generally brought up in a relatively similar manner. They get some didactic stuff first and are gradually introduced to their responsibilities.
Heck, even Jedi don't normally just spend a few hours with Yoda and suddenly are deemed worthy... (Luke was the exception) they're supposed to be trained from almost birth and takes what, 15-19 years to become a Jedi Knight?
If a zero-to-hero Paramedic program was built along the same lines, by the end of the program, the resulting Paramedics could be as "good" as any other graduate from any other good program.
Of course the downside of any zero-to-hero program is that the students might just find out too late that they really don't like that profession...